SeniorFullStackEngineer

LightFeather is seeking a Senior Full Stack Engineer to support a federal government client in modernizing critical mission systems for DHS ICE. You will own full stack delivery with a focus on translating complex legacy system behavior into clean, scalable software. The current environment includes large legacy systems managing operational workflows such as processing, tracking, and encounter management. These systems carry layers of business rules, manual processes, and tightly coupled functionality. The core challenge is understanding how they work in practice, identifying mission-critical functionality, and translating it into a modern platform-based architecture. The client is adopting Palantir as the target modernization platform. This is a Full Time, Remote Position. Location: Fully Remote (EST hours) Job Type: Full-time Clearance Requirement: U. S. citizenship is required for this position due to federal contract requirements. Candidates must currently hold an active Public Trust and be able to maintain it. This role does not offer sponsorship for a Public Trust — applicants without a current, active Public Trust will not be considered. Responsibilities: Design, develop, and maintain full stack applications supporting modernization of DHS ICE systems. Analyze legacy systems and workflows to identify core functionality vs. unnecessary process overhead. Translate operational requirements into scalable, modern application designs. Develop backend services, APIs, and integration layers connecting legacy environments to modern platforms. Build and enhance user-facing components using modern front-end technologies. Support the full SDLC: analysis, design, development, testing, deployment, and maintenance. Troubleshoot issues across application, integration, and data layers. Collaborate with stakeholders to clarify requirements and improve system behavior. Participate in code reviews and uphold engineering best practices. Required Qualifications and Skills: U. S. C